Poison in the Vent

Can an iron ladder rung take four hundred pounds of lead-weighted diver and salt-soaked neoprene without snapping under the strain? Tidjani gripped the slime-slick rung five feet beneath the churn, resting his boot heels on the masonry sill of the collection weir while water poured off his copper-alloy breastplate. His chest gauge read ninety-five bar in the lumbar bailout cylinder—barely seven minutes of breathable trimix if he had to stay under. He needed unflooded concrete, an atmosphere that would not poison a man through his teeth, and an intact hydraulic line to crack the emergency sluices before the El-Mellah district took four feet of septic sewage.

He drove his shoulder upward, breaching the scum-crusted surface into dead air.

No alarms sounded. The lower mezzanine cavern stretched into the gloom under soot-blackened barrel vaulting. Raw sewage sloshed against the lip of the concrete platform four inches below the grating, but the deck was dry. The heavy stink hit his throat the instant he cracked the exhaust dog on his neck ring: not just the rotten-cabbage sulfur of Rot-Crown necro-gas, but the sharp, acrid bite of spent cordite and scorched copper wiring.

Tidjani hauled his bulk over the diamond-tread lip. The cast-bronze spud wrench banged against his thigh ring with a dull chime. He knelt on one knee in the shadow of an intake duct, letting the water sheet from his utility belt onto the iron mesh. With his left hand, he twisted the side wing-nuts on his helmet collar, unseated the primary seal, and tipped the bronze dome back onto its safety tether.

Cool, stale air rushed across his sweaty scalp. His temples throbbed from ninety minutes of pressurized gas, but he shut off the bailout cylinder valve with two crisp turns of his wrist. Seven minutes remained on the needle. He would keep those seven minutes in his pocket until the water forced his head back under.

He swung the seized spear carbine forward, resting the rubber-molded grip across his forearm. He snapped the halogen torch back into its bracket beside the trigger guard. He clicked the rotary switch one notch, dropping the beam to a pencil-thin beam of low-intensity amber.

Ten yards down the catwalk, a pair of rubber work boots hung three inches above the deck.

Tidjani moved along the wall, his felt-soled diving overshoes padding silently across the wet steel grating. The air grew thicker with the sweet reek of copper and burnt hair.

The boots belonged to Nabil Hamdi, the junior night mechanic who worked the oiling pans on Turbine 4.

Hamdi was lashed to an upright roof stanchion with three loops of heavy green nylon strapping. His blue municipal boiler suit was soaked in oil and dark, coagulated blood that had pooled across the bib of his overalls. Two clean entry wounds marked the center of his forehead, powder-burned at near-contact range. A ragged strip of duct tape sealed his jaw, but his eyes were open, fixed on the empty floorplates between his feet. His hands were bound behind the iron column with ribbed plastic zip-ties, his fingernails split from trying to work the steel edges of the beam.

Tidjani stopped two paces away. He did not touch the corpse. In the municipal tunnels, you touched a dead man only if you intended to carry him to the winch sling, and there was no winch truck running tonight.

"Told you to take the harbor ferry job, kid," Tidjani murmured under his breath, his voice like gravel grinding in a concrete mixer. "Pensions are garbage, but the deckhands don't shoot you through the cap."

He swept the narrow beam downward, past Hamdi's dangling boots, and found what the killers had left at the base of the pillar.

Bolted against the concrete bulkhead stood the auxiliary hydraulic rack. Three high-pressure fluid accumulators—painted peeling municipal orange and stamped with nineteen-seventy inspection marks—fed the backup manual controls for the main sluice gates. If the surface solenoids failed, a diver or mechanic could crank the brass hand pump beside the accumulator to force thirty liters of oil through the lines and lift the lower gates by hand.

Strapped across the three accumulators was a heavy canvas rig containing two rectangular bricks of industrial demolition compound. Stamped along the grey vinyl wrapping were yellow serial stencils: THERM-EX COMMERCIAL CUTTING CHARGE - SEBKHA MINING LOGISTICS.

Tidjani knelt in front of the manifold. A digital countdown timer the size of a cigarette pack was glued to the center block, wired into two electric blasting caps seated inside copper booster wells. The liquid-crystal display flickered with cold red segments: 04:18.

Four minutes and eighteen seconds before the charges ignited.

When thermite of that grade burned, it did not detonate with an air shock; it burned at four thousand degrees, melting solid cast iron into incandescent slag in three seconds flat. It would turn the accumulators, the bypass valves, and the backup hydraulic rams into a puddle of bubbling metal, welding the sluice gates shut forever.

Tidjani leaned closer, smelling the almond scent of stabilizer solvent leaking from the booster sealant. A wry, disgusted grimace pulled at the scar across his cheek. The Sebkha Consortium had spent five thousand dinars on imported corporate demolition gear just to wreck a fifty-year-old municipal manifold that the city council wouldn't authorize twenty dinars to scrape and paint.

He slipped his right hand into his utility pouch and pulled out his stainless-steel diver's cable snips.

Two wires led from the digital timer to the first detonator: a red command lead and a striped yellow trace. But behind the timer body, running flat against the accumulator tank, ran a thin copper loop looped through the mounting bracket.

An anti-tamper ground shunt. Cut the red wire first, and the drop in circuit resistance would dump the capacitor's residual charge straight through the bridge wire of the cap, flashing the magnesium primer instantly.

Tidjani drew a slow breath through his nose. His hands were calloused, numb from forty-degree canal water, but the muscle memory was twenty years deep in salvage yards and flooded engine rooms. He did not pull the timer away from the charge. Instead, he worked the slender jaw of the snips behind the bracket, feeling for the cold wire against the painted tank.

He pinched the copper ground loop between the shear blades, not cutting, but clamping down until the soft metal compressed against the bare steel of the accumulator housing, earthing the circuit to forty tons of structural ironwork. With his left thumb, he pinned the ground against the metal.

With his right hand, he snapped the yellow return wire.

The red numbers on the display froze at 03:41.

The squib did not pop. No spark jumped across the booster well.

Carefully, sliding his fingers along the copper sleeve, Tidjani drew the primary blasting cap out of the putty well. The grease around the collar was tacky and smelled of paraffin. He worked the second cap free from the adjacent block, clipped both leads at the base of the timer, and dropped the live detonators into the empty neoprene pouch of his weight belt.

Without the electric caps, the two blocks of thermite were nothing more than thirty pounds of inert metallic powder and binder clay.

Tidjani stood up, his knee joints popping under the seventy pounds of bronze breastplate and belt lead. He wiped a smudge of conductive grease onto the leg of his drysuit and picked up the spear carbine.

At the end of the catwalk, twenty yards past the dead mechanic, stood the heavy blast door leading into the turbine control center.

The door was dog-latched from the inside, but the armored viewing glass in the upper hatch had been shattered. Through the six-inch opening, yellow halogen light spilled into the darkened corridor, accompanied by the low, steady rumble of a portable generator.

Tidjani stepped onto the rubber runner beside the wall, avoiding the creaking steel floor grates.

Through the cracked glass, the sound carried clear and sharp: the scrape of combat boot treads over broken safety glass, the metallic clatter of an ammunition crate being dropped onto a console desk, and the flat, clipped cadence of a tactical radio receiver barking in the silence.

"Intake four is locked," a man's voice rasped from inside, speaking with the crisp northern coastal accent of private maritime security. "The contractor's barge is offloading the second clutch at the canal bridge. Sweep the mezzanine once more and shoot anything that twitches."